Yes you convert from Lightweight to Autonomous : Info: k9w7 – autonomous IOS. k9w8 – full lightweight IOS. Cisco Community
The 152-2.jb version holds a significant place in Cisco’s wireless evolution. It arrived during the transition from 802.11n to early 802.11ac Wave 1. While the 2600 series APs are primarily 802.11n (with 3x4 MIMO), this firmware brought several critical enhancements: